Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...480..794l&link_type=abstract
Astrophysical Journal v.480, p.794
Astronomy and Astrophysics
Astronomy
18
Stars: Individual Constellation Name: Beta Virginis, Stars: Oscillations, Sun: Atmosphere, Sun: Oscillations
Scientific paper
We present and discuss a method to determine the phase shift of the global acoustic oscillations of solar-like stars. This quantity can be used to infer the main contributors of the mechanical behavior of the acoustic waves in the outer layers of the star as far as the energy transport and the photospheric helium abundance are concerned. The phase shift is obtained for the Sun and for a specific candidate, beta Virginis (HD 102870), in the perspective of interpreting the next generation of asteroseismology measurements. It is found that the signature of the ionization of helium is better determined in a solar-like star slightly more massive than the Sun and that this analysis can provide a very useful indicator of the photospheric helium content, particularly in clusters. We also find a noticeable sensitivity to the value of the mixing-length parameter.
Goupil Marie Jo
Lopes Ilidio
Michel Eric
Turck-Chieze Sylvaine
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